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Find a subset (Posted on 2005-08-24) Difficulty: 3 of 5
Given N integers a1, a2, ... aN prove there exists a (non empty) subset whose sum is a multiple of N. (Allow repeated numbers in both the original set and its subsets.)

See The Solution Submitted by Federico Kereki    
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Question what is a subset? | Comment 1 of 6
Can someone tell me does the whole set count as a subset?
  Posted by Percy on 2005-08-24 18:30:13
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